I just finished fixing the nose of my board following this sequence: fiberglass with epoxy, epoxy with filler, sanding, primer and epoxy paint. My question is, what can I do to protect the paint from schatches, scuffs, etc? New boards seem to have a protective coat on top of the paint, maybe polyurethane?

Might sound daft but I use high build primer (spray).It seems as hard as anything (definitely harder than clear coatings) and you can usually find a colur to match as long as your board is off white or grey !